Q13 / 75 · JEE Main 2026 (04 April Shift 1) · Chemistry

Increasing order of electron withdrawing power of following functional groups is:
a. $-CN$
b. $-COOH$
c. $-NO_2$
d. $-I$

  • A
    $c < b < d < a$
  • B
    $c < a < b < d$
  • Correct answer
    C
    $d < b < a < c$
  • D
    $a < b < c < d$

Solution

The electron withdrawing power ($-I$ effect) of various functional groups follows the standard experimental order:

$-NO_2 > -CN > -COOH > -F > -Cl > -Br > -I$

Based on this series, the increasing order of electron withdrawing power for the given groups is:

$-I < -COOH < -CN < -NO_2$

This corresponds to the sequence $d < b < a < c$.

Answer: $d < b < a < c$

Hence, the correct answer is option: 'C'.

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